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Questions and Answers
What type of foundation is placed near the surface and transfers loads to the ground?
What type of foundation is placed near the surface and transfers loads to the ground?
- Shallow Foundation (correct)
- Retaining Wall Foundation
- Deep Foundation
- Basement Foundation
Spread footing is a type of shallow foundation.
Spread footing is a type of shallow foundation.
True (A)
Which of the following is NOT a type of shallow foundation?
Which of the following is NOT a type of shallow foundation?
- Basement Foundation (correct)
- Pile Foundation
- Spread Footing
- Mat Foundation
What are the three different types of failure that affect shear capacity?
What are the three different types of failure that affect shear capacity?
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The foundation should resist overall shear failure where the condition is $Pf < 1.3 imes 4YB$.
The foundation should resist overall shear failure where the condition is $Pf < 1.3 imes 4YB$.
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What happens when the ultimate bearing capacity (gu) of the foundation is reached?
What happens when the ultimate bearing capacity (gu) of the foundation is reached?
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Study Notes
Shallow Foundations
- A shallow foundation is placed near the surface of the ground, providing stability without deep excavation.
- Designed to transfer building loads to the soil.
- Spread over a broader area.
Types of Shallow Foundations
- Spread footing
- Mat foundation: A large slab that covers the entire footprint of a building.
- Pile foundation (also known as a drilled shaft foundation)
Foundation Failure
- Occurs when the ultimate bearing capacity (gu) of the foundation is reached.
- Caused by shear failure.
- Influenced by bearing pressure, soil type, and geometric dimensions of the foundation.
Shear Capacity
- Shear capacity decreases with increasing depth of the foundation.
- Soil types can be categorized into three different types of shear failure.
Overall Shear Failure Considerations
- The foundation must be able to resist overall shear failure.
- This is represented by the equation: $Pf < 1.3 \sim 4YB$
- $Pf$ = Foundation pressure
- $Y$ = Unit weight of soil
- $B$ = Width of foundation
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